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  2. Duplex (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Duplex_(telecommunications)

    For example, in TV and radio broadcasting, information flows only from the transmitter site to multiple receivers. A pair of walkie-talkie two-way radios provide a simplex circuit in the ITU sense; only one party at a time can talk, while the other listens until it can hear an opportunity to transmit. The transmission medium (the radio signal ...

  3. Radio receiver - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver

    The reflex receiver, invented in 1914 by Wilhelm Schloemilch and Otto von Bronk, [136] and rediscovered and extended to multiple tubes in 1917 by Marius Latour [136] [137] and William H. Priess, was a design used in some inexpensive radios of the 1920s [138] which enjoyed a resurgence in small portable tube radios of the 1930s [139] and again ...

  4. 1.25-meter band - Wikipedia

    en.wikipedia.org/wiki/1.25-meter_band

    The 1.25-meter, 220 MHz or 222 MHz band is a portion of the VHF radio spectrum internationally allocated for amateur radio use on a primary basis in ITU Region 2, and it comprises frequencies from 220 MHz to 225 MHz. [1]

  5. Antique radio - Wikipedia

    en.wikipedia.org/wiki/Antique_radio

    The 32-volt system could also power other specially made appliances as well as electric lights around the farm. Other farm radios, especially from the late 1930s to the 1950s, reverted to using a large "A-B" dry cell that provided both 90 V for the tube plates and 1.5 V for the tube filaments, as did most tube-based portable radios of that era.

  6. SITOR - Wikipedia

    en.wikipedia.org/wiki/SITOR

    Amateur radio uses SITOR but calls it AMTOR, AMateur Teleprinting Over Radio. [2] AMTOR-A is SITOR-A. AMTOR-B (also called AMTOR-FEC) is SITOR-B. [ 3 ] In 1991, an AMTOR extension was described that includes lower case and other printable ASCII characters.

  7. Simplex signaling - Wikipedia

    en.wikipedia.org/wiki/Simplex_signaling

    Simplex is also used to describe a powering method where one or more signal conductors carries direct current to power a remote device, which sends its output signal back on the same conductor. Phantom powering as used in audio is a form of simplex powering, as the return current flows through the ground or shield conductor.

  8. Selective calling - Wikipedia

    en.wikipedia.org/wiki/Selective_calling

    In a simplex system, the 5-tone just opens the speaker of the desired partner. In a repeater system, another CTCSS or tone-burst or 5-tone is needed to activate the company's repeater, depending on the systems design. If the called radio is within reach of the sender, it answers the incoming call with its stored receipt tone.

  9. Radioteletype - Wikipedia

    en.wikipedia.org/wiki/Radioteletype

    Radioteletype tuning indicator Tuning indicator on cathode ray tube. Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected by radio rather than a wired link.

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